On Wednesday, August 28, 2013 06:41:47 PM Colin Cross wrote: > Joseph Lo <josephl@xxxxxxxxxx> reported a lockup on Tegra20 caused > by a race condition in coupled cpuidle. When two or more cpus > enter idle at the same time, the first cpus to arrive may go to the > ready loop without processing pending pokes from the last cpu to > arrive. > > This patch adds a check for pending pokes once all cpus have been > synchronized in the ready loop and resets the coupled state and > retries if any cpus failed to handle their pending poke. > > Retrying on all cpus may trigger the same issue again, so this patch > also adds a check to ensure that each cpu has received at least one > poke between when it enters the waiting loop and when it moves on to > the ready loop. > > Reported-by: Joseph Lo <josephl@xxxxxxxxxx> > Tested-by: Stephen Warren <swarren@xxxxxxxxxx> > Tested-by: Joseph Lo <josephl@xxxxxxxxxx> > Signed-off-by: Colin Cross <ccross@xxxxxxxxxxx> Still stable material I suppose? Queued up for 3.12, thanks! -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- To unsubscribe from this list: send the line "unsubscribe linux-tegra" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
